Screening apparatus



C. W.' BRUCE. SCREENING APPARATUS. AIPUCATIOH FILED 1ULY1,1921-inventor, 27 L Z6 Patented Jan. 31, 1922.

CARL W. BRUCE, O TORONTO, ONTARIO, KUANADA.

SCREENING APY'ABA'IUS.

Specification of Letters Patent. I

p tented Jan, at; ieee.

Application filed .Tuly l, 1921. Serial No. 481,842.

To all 71'7")? it may concern Be it known that l. Cam, lV. lliutcri. asubject of the Kins of Great Britain, and resident of 22 Maitland St, inthe city of Toronto, in the county of York, in the Province of Ontario.in the Dominion of Canada, have invented certain new and usefulImprovements in .wcreeninn Apparatus, of which the following is aspecification.

The invention relates to improvements in screening apparatus asdescribed in the present specification and shown in the accompanyingdrawings that form a part of the Still]?- The invention consistsessentially of the novel means employed for imparting a vibratory motionto a screen.

The objects of the invention are to insure proper screening of thematerial, to lessen the cost of such work and generally to providescreening apparatus which will be. inexpensive. of construction,efficient in operation, and durable.

In the drawings Figure 1 is a diagrammatic view of a screen and themeans adapted for vibrating same.

Figure 2 1s a side elevation of a modified form 015 mechanism forvibrating the screen.

Figure 3 is a plan view of a portion of a screen and showing one of theguides therefor.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings 1 is an elongated tapered chute swinginglysupported at its forward end in a frame 2 by means of arms 3 pivotallysecured to the opposing inner faces of said frame and pivotally securedto the outer sides respectively of said chute, said chute beingsupported to the rear of its longitudinal centre by means of a yoke 4pivoted to opposite sides thereof and having a connecting arm 5pivotally depending from a link 6 which in turn is pivotally supportedcentrally thereof from a beam 6 or other desirable supporting member.

The rear portion of the chute is provided with a screen bottom forming asieve 7 through which the fine particles of sand or other material beingscreened are adapted to pass into any convenient form of receptacleadapted to be located therebelow.

8- is a bar pivotally secured to the free end of the link 6 andextending substantially at right angles to the arm 5 and supporting fromits free end a split collar 99 10 is a l-ine sh'aft' rotatablymounted ina hearing membenll supported-by the beam (5 and having rigidly mountedthereonan cccentricmember 13 operating within the collar 9 and adaptedon'rotation to impart; a reciprocating movement to the bar 8 and as saidbar 8 and the arm '5 are pivoted to opposite ends of the pivoted link 6a vertical reciprocating movement-Will be imparted to said arm andconsequently to the rear portion of the chute. 14lare rollers rotatablymounted on pins 15' projecting outwardly from opposite sides of thechute l. slightly to the rear of the yoke t and being adapted toreciprocate vertically in guides in the frame 2, said guides eachcomprising two members 16 of right angular cross section secured to theinner sides of the frame at a slight rearward angle, so that thevertical reciproca-tory movement imparted to the chute will betranslated to a swinging motion thus serving to thoroughly agitate thematerial on the screen and impart a slight forward impetus to the largep: rticles to start them on theirway down "the chute.

in Figure 2 of the drawings a modified Bil form of construction is shownin which the arm 5 from the chute is provided at its upper end with asplit collar 1'? in which operates an eccentric member 18 which isrigidly mounted on a horizontal shaft 19 journalled in brackets 20 froma beam 21, said shaft 19 being; connected to a driven pulley 22 by meansof a belt 23 operating over said driven pulley and over a pulley 24 onsaid shaft 19 In the operation of this invention the shaft 10 is set inmotion through the operation ofthe drive mechanism and the sand or othermaterial is fed to the screen 7 by any convenient means and as thechuteis pivotally supported by the yoke 4: and the arms 3 a swingingmotion is imparted thereto through the vertical movement of the arm 5and the rollers 14: operating between the rearwardly' inclined guidemembers .16. causing the small particles to be forced through the screeninto a convenient form of container while the larger particles roll downthe chute What I claim is In screening apparatus, a frame, a chuteswingingly mounted at its forward end in said frame, and having the rearper 01": its bottom in sieve form, a yoke pivot rigid arm, a. supportingbracket, 2,

secured to said chute adjacent to said sieve portion and having anupwardly projecting link pivoted centrally thereof to said supportingmember and at one end being pivotally connected to said arm, ahorizontally arranged bar pivoted to the other endcof said link andcarrying at its outer end a split collar,

I a line shaft, an eccentric rigid with said sheft and operating insaidsplit collar for reciprocating said bar, reerwerdly extendi ,eoseee ingguide members secured to the inner faces respectively of said frame androllers projecting from the outer sides of said chute and operatingbetween said guide members.

Signed at the city of Toronto, this 24th day of June 1920.

cine W. BRUCE.

Witnesses:

G. MURPHY, F. C. BizowLnir.

